Method of pressurizing treatment of pre-foamed particles of polyolefin resin
US4443393A · kind A · utility
41Cited by
8References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1982 |
| Grant date | Apr 17, 1984 |
| Priority date | — |
| Expiry date | Dec 7, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/15
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for pressurizing pre-foamed particles of a polyolefin resin by maintaining the pre-foamed particles in an atmosphere of a pressurized gas to impart a predetermined internal pressure thereto, which comprises first maintaining the particles under a pressure which does not cause shrinkage to the particles, and then increasing the applied pressure gradually under conditions which do not cause shrinkage to the particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.